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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4a459f1a564851781d4b6e6a31f00c4c9d6a846d8d4523b7704d0e7f0d71b14' 
  AND token = 'UCPZNdx3NNz+WKrtykL1zxZRLzbNWpnZP+ERhqR1SEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}